Reversible propeller



UNITED safer-s 1 PATENTI'AOFFICE.

PAISLEY, soorL ND.

REVERSIBLE PROPELLER.

To all whom it may concern:

Be it known that we, DAVID COCKBURN and EDWARD MCDONALD, subjects of the King of the United Kingdom of Great Britain and Ireland, and residing at Cardonald, near Glasgow, Scotland, and Paisley, Renfrewshire, Scotland, respectively, have invented a certain new and useful Improvement in Reversible Propeller, of which the following is a specification.

This invention relates to reversible'propellers comprising angularly movable blades which are mounted on a boss secured on the outer end of a tubularpropeller shaft and shiftable angularly by a reversing rod accommodated in the tubular shaft and pro vided with means for efiecting angular adjustment of the blades.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a part elevation part section of the propeller and associated mechanism and Fig. 2 is a section of the clutch. V

V The mechanism shown comprises a double clutch of which the male member 1 is movable axially into three positions i. 'e.,

the driving ahead position, the driving astern position and the free position. The male member 1, which is formed with two oppositely inclined conical faces 2, 3, is secured on the tubular propeller shaft 4, while the female member 5, which is formed with complemental faces 6, 7, is secured on 'the driving shaft 7, the last named faces being spaced to provide an idle position for the member 1. An axially immovable reversing rod 8 is anchored at 9 in the female member and operatively connected to the propeller blades 10 by pins 11 en aging cam slots 12 in the roots 13' of the lades. For imparting axial shifting movements to the propeller shaft 4 and therewith to the male clutch member 1 relatively to the reversing rod 8, there is provided a hand lever 15 fulcrumed at 16 and fitted with rollers 17 engaging a grooved collar 18 secured to the shaft l. The arrangement is such that, when the clutch member 1 is moved into the driving ahead position or into the driving astern position, the propeller blades are constrained to occupy corresponding positions on the propeller boss and, when the member 1' is moved into the free position, shown clearly in Fig. 2, the propeller blades occupy the inoperative position.

Specification of Letters Patent.

1 A plication med December 23, 1921.:Seria1-No. 524,555.

Patented June 6, 192 2.

' For effecting axial adjustment of the an chorage "for the'rever'sing "rod relatively to the female clutch member so that the pitch of the blades may be correspondingly varied 3 there is provided adjusting means comprising a crank pin '19 journalled in the member 5 and engaging a slidable plug 9 constituting the reversing rod anchorage and a quadrant 20 for imparting rotation to the pin 19, the quadrant 20 being associated with a locking screw 20 engaging a slot 2l in the quadrant and serving to 'retain'the pin 19 in adjusted position. The driving shaft 7 'must be stationary when such adjustment is made.

We claim,

1. In a reversible propeller, in combination, a driving shaft, a tubular propeller shaft, a double female clutch member on said driving shaft, a double male clutch member fitted on said propeller shaft and I adapted to perform axial movements in relation to said female. clutch member, a boss on said propeller shaft, propeller blades mounted to perform angular shifting movements on said boss, a reversing rod accom- .modated in the bore of said tubular propeller shaft and operatively. connected at one end to said blades and an anchorage for the other end of said rod, said anchorage being adjustably mounted in said female clutch member.

2. In a reversible propeller, in combination, a driving shaft, a tubular propeller shaft, a double female clutch member on said driving shaft, a double male clutch member fitted on said propeller shaft and clutch member and means for effecting adjustment of said anchorage. 1

3. In areversible propeller, in combination, a driving shaft, a tubular propeller shaft, a double female clutch member on said driving shaft, a double male clutch member fitted on said propeller shaft and adapted to perform axial movements in readapted to perform axial movements in relation to said female clutch member, a boss on said propeller shaft, propeller blades mounted to perform angular shifting movements on said boss, a reversing rod'accominodated in the bore of said tubular propeller shaft and operatively connected at one end to said propeller blades, an anchorage for the other end of said rod, said anchorage being adjustably mounted in said female clutch member, means for effecting adjustment of said anchorage, said adjusting means comprising a crank pin journalled in the female clutch member and engaging the anchorage, a quadrant secured to said crank pin and a locking screw engaging said 15 MAY Ross. 

